The Super Duty MOD1 incorporating continuous design development to provide superior ergonomics and modularity while maintaining the legendary balance of performance and reliability. The Super Duty featuring Geissele cold hammer forged, chrome lined barrel; Phased Array gas system; Geissele braided buffer spring; SSA-E X two-stage trigger with Lightning Bow; Airborne charging handle; Geissele SMR MK16 w/center tab; configurable safety selector; Geissele A17 grip and Geissele QD sling mount endplate.